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  2. Aviation light signals - Wikipedia

    en.wikipedia.org/wiki/Aviation_light_signals

    Air traffic control signal light gun in use at base flight tower. In the case of a radio failure or aircraft not equipped with a radio, or in the case of a deaf pilot, air traffic control may use a signal lamp (called a "signal light gun" or "light gun" by the FAA [1] [2]) to direct the aircraft.

  3. Air traffic control radar beacon system - Wikipedia

    en.wikipedia.org/wiki/Air_traffic_control_radar...

    The antenna system of a typical air traffic control radar, the ASR-9. The curved reflector antenna on the bottom is the primary surveillance radar (PSR), and the flat antenna on top of it is the secondary surveillance radar (SSR). In operation the antenna rotates about a vertical axis, sweeping a vertical fan-shaped beam of microwaves around ...

  4. Optical communication - Wikipedia

    en.wikipedia.org/wiki/Optical_communication

    Aviation light signals are used in the case of a radio failure, an aircraft not equipped with a radio, or in the case of a hearing-impaired pilot. Air traffic controllers have long used signal light guns to direct such aircraft. The light gun's lamp has a focused bright beam capable of emitting three different colors: red, white and green.

  5. Outlawed anti-drone radio jammers are being marketed on ... - AOL

    www.aol.com/news/anti-drone-companies-market...

    Several online retailers and drone technology companies are marketing the sale of radio frequency jammers as drone deterrence or privacy tools, sidestepping federal laws that prohibit such devices ...

  6. ATC - Wikipedia

    en.wikipedia.org/wiki/ATC

    Air traffic control, a service provided to aircraft by ground-based controllers Air traffic controller, people who expedite and maintain a safe and orderly flow of air traffic in the global air traffic control system; Air Tanzania Corporation, the former state-owned airline of Tanzania

  7. Missing Girl, 17, Who Reportedly Left Home After Family ... - AOL

    www.aol.com/lifestyle/missing-girl-17-reportedly...

    Jennaleah “Jenna” Hin, 17, of Henderson, Nevada, was reported missing since Dec. 30 after she reportedly left home following a family dispute

  8. The Best Vegetarian Protein to Buy at Costco, According to ...

    www.aol.com/1-plant-based-protein-buy-120000190.html

    For a speedy lunch or light dinner, try them in our Black Bean-Quinoa Bowl or this No-Cook Black Bean Salad. Or, get a jump-start on your day with our nutrient-packed anti-inflammatory breakfast bowl.

  9. Swedish railway signalling - Wikipedia

    en.wikipedia.org/wiki/Swedish_railway_signalling

    Authorises the driver to pass the signal at 80 km/h (50 mph) or at a higher speed given by the ATC system. [3] Signs can give a lower or (if no ATC) higher speed. The signal changes to red when the train passes the track circuit limit a few metres in front of the signal, so passengers might see the signal showing red. Proceed 40, caution